RU2569526C1 - Unit for dual operation of wells - Google Patents

Abstract

FIELD: oil and gas industry.

SUBSTANCE: unit includes a flow column, a sleeve with a shank, a bottom-hole submersible pump with a hydraulic nozzle at suction, which is connected to a hollow actuating rod arranged in the flow column; the latter are enclosed in the sleeve with a radial hole interconnected with a channel of the hydraulic nozzle above the packer, and an electric submersible pump with and inlet module and an electric motor. The unit is complete with a filtering element mounted through a sleeve to the locking shoe. A chamber is mounted at the sleeve thus allowing separation of the sucker-rod pump suction from pumped fluid of the lower formation.

EFFECT: higher operating reliability of the downhole pump unit.

1 dwg

Description

The invention relates to the oil industry, in particular to borehole pumping units, and can be used for simultaneous-separate and alternate operation of two layers of one well.

A known pump installation for simultaneous, separate, continuous, alternate, periodic or combined operation of well strata, comprising a pump lowered into a well on a pipe string, two packers of mechanical or hydraulic action with or without cable entry, one of which is installed above the upper formation, and the other is between the layers. The pump is made with a casing and is placed between the packers or above the packer located above the upper layer. The casing is connected to a packer or to packers. Between the casing and the packer there is a bypass assembly or gas separator. Pump packer installation provides increased reliability and functionality and operational efficiency of a well that has opened several layers (Patent RU No. 2296213. Pump packer installation for operation of well strata. - IPC: Е21В 43/14. - Publish. March 27, 2007, bull. No. 9 ) A disadvantage of the known pumping unit is the lack of efficiency in the operation of the layers by the well due to the complexity and duration of its maintenance.

Closest to the claimed invention is a pump installation for simultaneous and separate operation of two layers contains a column of elevator pipes, a sleeve, a packer, a submersible sucker rod pump with a hydraulic nozzle for pumping product from the upper layer, connected to a drive hollow rod located in the column of elevator pipes, the last enclosed in a sleeve having a radial hole in communication with the channel of the hydraulic nozzle above the packer, and an electric drive submersible pump with an input module for pumping product from the lower layer, the electric motor of which is hermetically connected to the power cable, and a check valve is installed at the outlet of the electric drive pump, which communicates with the annular space through the cavity formed between the rod pump cylinder and the sleeve, on the latter there is a shank with which the pump unit is fixed in the packer. The sleeve shank communicates with the check valve of the electric drive pump through the intermediate pipe and the coupling, and a jet ejector is installed in the cavity of the liner to suck gas from the annulus through the radial channels of the coupling, communicating with the annular space through the gap formed between the ends of the shank and the intermediate pipe below the packer why the docking sleeve has a socket for landing a jet ejector, while the hydraulic nozzle is installed in the sleeve using cuffs with a stop in the collar with an inner diameter larger than the outer diameter of the jet ejector, and is mounted on the collar by a expanding collet with the possibility of removing the sucker rod pump and jet ejector from the installation, and a bypass channel is made in the sleeve, which informs the volume in the sleeve below the hydraulic nozzle with the annulus above packer through the cavity between the cylinder of the sucker rod pump and the sleeve (Patent RU No. 2488689. A downhole pumping unit for simultaneous and separate operation of two layers. - IPC: Е21В 43/14. Publ. 07/27/2013, bull. 21).

The disadvantage of this pumping unit is the complexity of its execution, which reduces the reliability of its operation and increases the duration of well repair.

The technical problem to be solved by the claimed invention is directed is to increase the reliability of a well pump installation and reduce the time for repairing a well.

The problem is solved in that the borehole pumping unit for simultaneous and separate operation of two layers, containing a column of elevator pipes, a packer, a sucker rod pump with a filter at the receptacle with a sleeve with radial holes for pumping product from the upper layer, connected to a drive hollow rod placed in the column of elevator pipes, the latter are enclosed in a coupling having a radial hole communicating with the channel above the packer, and an electric drive submersible pump with an input module for pumping the product from the bottom formation, the electric motor of which is hermetically connected to the power cable, according to the invention, the installation is equipped with a filter element that is installed through the coupling to the castle support, a pocket is hermetically sealed to the coupling, which allows disconnecting the sucker rod pump from the pumped fluid from the lower formation.

The installation of a filter element at the intake of the sucker rod pump will allow to avoid premature excessive wear and jamming of the plunger pair due to mechanical impurities entering the intake. The use of a filter element on the pump should increase the overhaul period, which will affect the economic use of this installation.

The drawing schematically shows the layout of a downhole pumping unit for simultaneous and separate operation of two layers.

A downhole pump installation for simultaneous and separate operation of two layers contains a column of elevator pipes 1, a packer 2, a jet ejector 3, a sucker rod pump 4 with a lock support 5 installed in the coupling 6, a filter housing 7, a filter element 8, a pocket 9 and an electric drive submersible a pump 10 with an input module for pumping the product from the lower layer, an electric motor 11, which is hermetically connected to the power cable 12, a hollow rod 13 of the rod pump. The figure also indicates the upper layer 14 and the lower layer 15.

According to the invention, the downhole pumping unit for simultaneous and separate operation of two layers is additionally equipped with a filter element 8, which is installed through a sleeve to the castle support 5.

The analysis of the prior art by the applicant has made it possible to establish that there are no analogues that are characterized by sets of features identical to all the features of the claimed borehole pumping unit for simultaneous and separate operation of two formations. Therefore, the claimed technical solution meets the condition of patentability "novelty."

Downhole pumping unit for simultaneous and separate operation of two layers works as follows.

A downhole pumping unit can be used both for joint production of a product with simultaneous operation of two layers, and separate or for subsequent operation of layers 14 and / or 15.

In the wellbore between the upper 14 and lower 15 layers at a certain depth, a packer 2 with a channel for the liner is installed. The sucker rod pump 4 is lowered into the wellbore on a string of elevator pipes 1 until the lock support 5 is sealed in the sleeve 6. The sleeve 6 has radial holes through which fluid flows, a pocket 9 is also installed that hermetically separates the pumped fluids.

The fluid flow pumped by the electric drive pump 10 from the lower reservoir 15 through the intermediate pipe, with a pressure passes through the nozzle of the jet ejector 3, creating a vacuum in front of its mixing chamber, entrains the separated gas from the annulus below the packer 2 through the holes in the sleeve 6, after which falls on the wellhead (not shown).

The fluid flow pumped by the rod submersible pump 4 from the upper formation 14, passing from the annulus above the packer 2, enters the filter 7 through the radial hole in the sleeve 6, by means of the rod submersible pump 4, driven by the hollow rod 13 with a surface drive, rises at the mouth wells.

During simultaneous and separate operation of the formations, the fluids simultaneously rise at the wellhead along the column of elevator pipes 1 from the electric drive pump 10 and along the hollow drive rod of the ground drive from the rod submersible pump 4. In this case, the formation fluids are not mixed. With the simultaneous operation of two layers, the fluids of the upper and lower layers rise at the wellhead and mix.

Claims (1)

A downhole pump installation for simultaneous and separate operation of two layers, comprising a column of elevator pipes, a packer, a sucker rod pump with a filter at the intake, connected to a drive hollow rod located in the column of elevator pipes, the latter are enclosed in a coupling having a radial hole communicating with the channel above the packer, and an electric drive submersible pump with an input module for pumping the product from the lower layer, the electric motor of which is hermetically connected to the power cable, characterized in that the installation ka is equipped with a filtering element, which is installed through the coupling to the castle support, a pocket is hermetically sealed to the coupling, which allows disconnecting the sucker rod pump from the pumped fluid from the lower reservoir.